The Motorola Radius M120 transceiver is a very affordable radio. They are abundantly available on Ebay and many other websites. There are a few things that you need to look out for if you plan to purchase one of these transceivers.
16 Pin Accessory Plug – The first thing I look for is to make sure the transceiver has a 16 pin accessory plug in the back. Some of the Motorola Radius M120 transceivers only come with a 5 plug accessory plug. This is only important if you plan to connect anything to the transceiver (i.e. – repeater controller, IRLP, Allstar Link, etc.).
Input Voltage – 13.2 VDC
Power Output – (Varies)
Frequency Range – (Varies)
Tone Encoded Squelch () – Yes
Digital Private Line (DCS) – Yes
I found that programming the Motorola Radius M120 can be quite a challenge. The article linked in the previous sentence explains how to accomplish this task.